a) \(\left(x-1\right)^2-\left(x+3\right)^2+\left(x+4\right)\left(x-4\right)\)
\(=x^2-2x+1-\left(x^2+6x+9\right)+x^2-16\)
\(=x^2-2x+1-x^2-6x-9+x^2-16=-8x-24\)
b)
\(2\left(3x-2\right)^2-3\left(2x+5\right)^2-6\left(x+1\right)\left(x-1\right)\)
\(=2\left(9x^2-12x+4\right)-3\left(4x^2+20x+25\right)-6\left(x^2-1\right)\)
\(=18x^2-24x+8-12x^2-60x-75-6x^2+6=-84x-61\)
bài 1 rút gọn biểu thức
a) (2x-5)^2-4x(x+3)
b) (x-2)^3 -6(x+4)(x-4)-(x-2)(x^2+2x+4)
c)(x-1)^2-2(x-1)(x+2)+(x+2)^2+5(2x-3)
bài 2 rút gọn biểu thức
a)(2-3x)^2-5x(x-4)+4(x-1)
b)(3-x)(x^2+3x+9)+(x-3)^3
c)(x-4)^2(x+4)-(x-4)(x+4)^2+3(x^2-16)
Rút gọn
a)(x-3)2-x.(x-6)
b)(2x+1)2-(3+2x).(2x-3)-4.(x+2)
c)(2x2-3x+1):(x-1)
a)(x+3)(x-1)-x(x-5) b)(2x-3)(2x+3)-4(x+2)^2 c)(x-1)^3-(x+2)(x^2-2x+4)+3x^2 Rút gọn biểu thức
1. Rút Gọn
a) -5x (x-3).(2x+4)-(x+3)(x-3)+(5x-2)(3x+4)
b) (4x-1)x(3x+1)-5x^2x(x-3)-(x-4)x(x-5)-7(x^3-2x^2+x-1)
c) (5x-7)(x-9)-(3-x)(2-5x)-2x(x-4)
d)(5x-4)(x+5)-(x+1)(x^2-6)-5x+19
e)(9x^2-5)(x-3)-3x^2(3x+9)-(x-5)(x+4)-9x^3
g) (x-1)^2 - (x+2)^2
Thanks mn nhiều ạ
Rút gọn biểu thức:
a/ -3x(x+2)2+(x+3)(x-1)(x+1)-(2x-3)2
b/ 2x(x-4)2-(x+5)(x+2)(x-2)+2(x+5)2-(x-1)2
Bài 1:Rút gọn biểu thức
a.(x-2)(2x-1)-(2x-3)(x-1)-2
b. x(x+3y+1) -2y (x-1) - (y+x+1)x
Bài 2: Tìm x
a. (14x^3 + 12x^2 -14x) :2x = (x+2) (3x-4)
b. (4x - 5) (6x+1) - (8x+3) (3x-4) =15
Tính (rút gọn )
1, 2x(3x-1)-(2x+1)(x-3)
2, 3(x^2-2x)-(4x+2)(x-1)
3, 3x(x-5)-(x-2)^2 -(2x+3)(2x-3)
4, (2x-3)^2+(2x-1) (x+4)
1/Rút gọn các biểu thức: a)(x+1)2-(x-1)2-3(x+1)(x-1)
b)5(x+2)(x-2)-(2x-3)2-x2+17
c)(x-3)3-(x-3)(x2+3x+9)+6(x+1)2
2/ Tìm x a) (x+4)2-(x+1)(x-1)=16
b) (x+2)(x2-2x+4)-x(x2+2)=15
Rút gọn các biểu thức sau:
a,(3x+1)^2-2(3x+1)(3x-5)+(3x-5)^2
b,(3x^2-y)^2
c,(3x+5)^2+(3x-5)^2-(3x+2)(3x-2)
d,2x(2x-1)^2-3x(x+3)(Õ-3)-4x(x+1)^2
e,(x-2)(x^2+2x+4)-(x+1)^2+3(x-1)(x+1)
f,(x^4-5x^2+25)(x^2+5)-(2+x^2)^2+3(1+x^2)^2
